I downloaded/installed the pdf-reader-0.9.0  using gem install.
I followed the usage advice from https://github.com/yob/pdf-reader/blob/master/examples/callbacks.rb
I posted my code in http://www.pastie.org/1369323
When running my test, I got:

Will process PDF files in "K:\_Projects\Ruby\_Ruby_Apps\Taxes\TaxData
\Year_End_Gain_Loss_Reporting"
Processing 2008_5275.pdf, filesize is 3434672 bytes
K:/_Utilities/ruby186-26_rc2/ruby/lib/ruby/gems/1.8/gems/pdf-
reader-0.9.0/lib/pdf/reader/buffer.rb:123:in `index': wrong number of
arguments (0 for 1) (ArgumentError)
[snip]

Incidentally,  the PDF file works fine when I open it in Firefox.

Any suggestions about how to get PDF-reading working in Ruby?